Awang, Noor Azura (2012) Study of four wave mixing in a highly nonlinear media and their applications / Noor Azura Binti Awang. PhD thesis, University Malaya.
Abstract
This thesis presents a comprehensive study of the four wave mixing (FWM) effect in the highly nonlinear fibre (HNLF) and semiconductor optical amplifier (SOA); and their applications. The nonlinearity parameters such as zero-dispersion wavelength (ZDW), chromatic dispersion (CD) and nonlinear coefficient of HNLF has successfully investigated by using several FWM techniques. Results from all techniques have been achieved approximately similar to the manufacturer specification. This technique is then employed for the measurement of the FWM power and FWM efficiency in a SOA, in addition to the gain performance, which is measured using conventional methods. Based on these parameters, a good agreement between experiments and numerical has been obtained. This characterization is important for nonlinear application such as wavelength conversion, fibre optic parametric amplifier (FOPA) and multiwavelength fibre laser. Wavelength conversion is a key for wavelength division multiplexed (WDM) networks. Wavelength converter based on HNLF and SOA are promising candidates for implementing wavelength conversion. This thesis presents a thorough investigation of new configurations of the wavelength converter generation by using degenerate case and nondegenerate case of FWM effect in nonlinear media. Most of wavelength conversion configuration used self-constructed dual-wavelength fibre laser as a signal and pump sources due to compact size as well as compatible with current telecommunications system. The dualwavelength fibre laser used in this thesis is more cost effective and inexpensive as compared to the tunable laser sources (TLS). It allows for a smooth wavelength tuning over a wide range and has high performance stability. In the case of a two independent laser sources from TLS, an effective wavelength conversion is achieved by using a lower pump power and signal in HNLF iii | ABSTRACT via the FWM effect. This configuration obtained a higher and flat of conversion efficiency and a Signal-to-Noise Ratio (SNR) over 20 nm and can provide an effective means of wavelength conversion for telecommunication applications. However, despite the high conversion efficiency, this configuration suffers from both higher cost as well as a smaller wavelength conversion band. The other application reported in this thesis is fibre optical based parametric amplifier (FOPA). The novelty of this configuration used is a ring cavity as opposed to the commonly used method of linear cavity. This configuration reduces the required pump power for the amplifications of the signal and also the generation of the idlers. The last application reported in this thesis is a stable multiwavelength fibre laser utilizing the FWM effect in HNLF is proposed and demonstrated. The multi-wavelength fibre is based on the ring cavity configuration, and utilizes a low power erbium doped fibre amplifier (EDFA) as a gain medium to generate 11 lines in the range of 1582 nm to 1600 nm and a SNR of 43 dB.
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